Bonaiuti, Giovanni, Gytis Cibulskis, and Karin Jansson. “A Public, Open and flexible Catalogue for E-Learning Products: Development of a «European Search Engine» for Courseware and Learning Objects”. Journal of e-Learning and Knowledge Society 1, no. 3 (October 7, 2012). Accessed December 4, 2024. https://je-lks.org/ojs/index.php/Je-LKS_EN/article/view/686.